Navigation System Description - Overview
The navigation system is a highly-sophisticated, hybrid locating system that uses satellites and a map database to show you where
you are and to help guide you to a desired destination.
The navigation system receives signals from the global positioning system (GPS), a network of 24 or more satellites in orbit around
the earth. By receiving signals from several of these satellites, the navigation system can determine the latitude, longitude, and
elevation of the vehicle. In addition, signals from the navigation unit's own gyro sensor and vehicle information (vehicle speed pulse)
enable the system to keep track of the vehicle's direction and speed of travel.
This hybrid system has advantages over a system that is either entirely self-contained or one that relies totally on the GPS. For
example, the self-contained portion of the system can keep track of vehicle position even when satellite signals cannot be received.
When the navigation system is on, the GPS can keep track of the vehicle position even when the vehicle is transported by ferry.
The navigation system applies all location, direction, and speed information to maps and calculates a route to the destination entered.
s you drive to that destination, the system provides both visual and audio guidance
Refer to the audio system Overview for the audio-navigation unit (display audio) and audio functions.
The navigation function is installed in the audio-navigation unit as an application. The basic navigation system is composed of the
audio-navigation unit, center display unit, vehicle information signals (vehicle speed pulse, reverse signal), and the GPS antenna.
Calculation of Vehicle Position
The audio-navigation unit calculates the vehicle position (the driving direction and the current position) by receiving the directional
change signals from the gyro sensor, and the travel distance signals from vehicle information (vehicle speed pulse, BACK LT (reverse)
Map Matching Tuning
Map match tuning means that the vehicle's position is properly indicated on mapped roads. The map data transmitted from the SD
card is checked against the current vehicle position data and the vehicle's position is indicated on the nearest road. Map matching
tuning cannot be done when the vehicle is on an unmapped road, or if the vehicle is far away from a mapped road.
GPS tuning improves the accuracy of the vehicle's actual position in relation to the GPS vehicle position. The audio-navigation unit
compares its calculated vehicle position with the GPS position. If there is a large difference between the two positions, the GPS tuning
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